Is CVE-2021-37973 actively exploited?

Yes. CVE-2021-37973 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-37973 be exploited remotely?

The attack vector of CVE-2021-37973 has not been classified yet.

What is the CVSS score of CVE-2021-37973?

CVE-2021-37973 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-37973

HIGHCISA KEVIN THE WILD

CVE-2021-37973

Published: November 3, 2021

EPSS:12.63%probability of exploitation in 30 daysPercentile:93.8th

Official Description

Google Chromium Portals contains a use-after-free vulnerability that allows a remote attacker, who has compromised the renderer process, to potentially perform a sandbox escape via a crafted HTML page. This vulnerability affects web browsers that utilize Chromium, including Google Chrome and Microsoft Edge.

NVD Source

CISA KEV Advisory

Google Chromium Portals Use-After-Free Vulnerability

Added to KEV: 2021-11-03Federal patch deadline: 2021-11-17

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

This high-severity use-after-free vulnerability in Google Chromium Portals could allow a remote attacker to escape the browser's sandbox. This is a critical issue for systems using Chromium-based browsers like Google Chrome and Microsoft Edge, with an EPSS score of 0.12635 indicating a high likelihood of exploitation.

This vulnerability is actively being exploited in the wild and is listed in CISA's KEV catalog, confirming its active use by threat actors.

Recommended Action

Update Google Chrome, Microsoft Edge, and any other Chromium-based browsers to the latest versions to patch this sandbox escape vulnerability.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-37973 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-37973 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.